ISO 3166 Part 1 Country Codes, 2nd Edition, Alpha-3
Identifies the coding system published in the ISO 3166-1 Standard for Country codes, 2nd edition, 3-character alphabetic codes.
iso3166-1edition2alpha3_iso3166-1edition2alpha3
http://purl.bioontology.org/ontology/HL7/iso3166-1edition2alpha3_iso3166-1edition2alpha3